I think the rarest medal is Seventh Column (or when TTK comes out it will probably be the one where you have to get seven kills in a row without getting hurt).
I've never seen anybody have Seventh Column before because it requires EXTREME luck and skill, so sign here if you have it, excluding me :(
so I can see it once in Destiny...
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Yeah u need self res warlocks for that
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Or you can snipe someone off spawn, but then again it's all just defying probability.